Add tags to saved queries

[glaslos]

Outcome: Queries can be tagged

Query metadata:

• A tag to be applied.

Tags:

• Tags have a type and a value

Flow:

This issue depends on #6

[Pravalika-Batchu]

Hi!

I’ve worked on this issue and submitted a PR with the implementation.
Could you please take a look and review it when you get time?

PR link: #121

Thanks!